main()
{
    int a,i,m;//lekai
    printf("There are following perfect numbeers smaller than 1000:\n");
    for (a=1;a<1000;a++){
        for (m=0,i=1;i<=a/2;i++)
        if (!(a%i))m+=i;
        if (m==a)
        printf("%4d",a);
    }
}